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Books > Science & Mathematics > Physics > Quantum physics (quantum mechanics)
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Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements (Hardcover, 2013 ed.)
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Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements (Hardcover, 2013 ed.)
Series: Springer Theses
Expected to ship within 12 - 19 working days
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In this book the author presents two important findings revealed by
high-precision magnetic penetration depth measurements in
iron-based superconductors which exhibit high-transition
temperature superconductivity up to 55 K: one is the fact that the
superconducting gap structure in iron-based superconductors depends
on a detailed electronic structure of individual materials, and the
other is the first strong evidence for the presence of a quantum
critical point (QCP) beneath the superconducting dome of iron-based
superconductors. The magnetic penetration depth is a powerful probe
to elucidate the superconducting gap structure which is intimately
related to the pairing mechanism of superconductivity. The author
discusses the possible gap structure of individual iron-based
superconductors by comparing the gap structure obtained from the
penetration depth measurements with theoretical predictions,
indicating that the non-universal superconducting gap structure in
iron-pnictides can be interpreted in the framework of A1g symmetry.
This result imposes a strong constraint on the pairing mechanism of
iron-based superconductors. The author also shows clear evidence
for the quantum criticality inside the superconducting dome from
the absolute zero-temperature penetration depth measurements as a
function of chemical composition. A sharp peak of the penetration
depth at a certain composition demonstrates pronounced quantum
fluctuations associated with the QCP, which separates two distinct
superconducting phases. This gives the first convincing signature
of a second-order quantum phase transition deep inside the
superconducting dome, which may address a key question on the
general phase diagram of unconventional superconductivity in the
vicinity of a QCP.
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